<template>
	<view>
		<view class="search-box">
		  <!-- 使用 uni-ui 提供的搜索组件 -->
		  <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i"
			@click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史列表 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)">
				</uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 延时器
				timer: null,
				// 关键词
				kw: '',
				// 搜索的结果列表
				searchResults: [],
				// 搜索历史
				historyList: []
			};
		},
		onLoad() {
			// 得到本地存储数据
		this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods:{
			
			// input输入事件处理函数
			input(e){
				clearTimeout(this.timer)
			this.timer = setTimeout(() =>{
					this.kw = e
					this.getSearchResults()
				},500)
			},
			async getSearchResults(){
				// 判断搜索列表是否为空
				if(this.kw === ''){
					this.searchResults = []
					return 
				}
			const { data: res } = await uni.$http.get('/api/public/goods/qsearch', { query: this.kw })
			if(res.code !== 200) return uni.$showMsg()
			this.searchResults = res.data
			this.saveSearchHistory()
			},
			gotoDetail(item){
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			//保存搜索关键词的方法
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)
				// 对搜索历史数据进行持久化的存储
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?query='+ kw
				})
			}
		},
		computed:{
			histories(){
				// ...展开运算符，代表该数组所有数据，不改变原来形势
			return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
 // 吸顶效果，固定顶部
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }
  .sugg-list{
	  padding: 0 5px;
	  .sugg-item{
		  display: flex;
		  align-items: center;
		  justify-content: space-between;
		  font-size: 12px;
		  padding: 13px 0;
		  border-bottom: 1px solid #efefef;
		  .goods-name{
			 // 文字不允许换行（单行文本）
			      white-space: nowrap;
			      // 溢出部分隐藏
			      overflow: hidden;
			      // 文本溢出后，使用 ... 代替
			      text-overflow: ellipsis;
			      margin-right: 3px;
		  }
	  }
	  
  }
  .history-box{
	  padding: 0 5px;
	  .history-title{
		  display: flex;
		  justify-content: space-between;
		  height: 40px;
		  align-items: center;
		  font-size: 13px;
		  border-bottom: 1px solid #efefef;
	  }
	  .history-list{
		  display: flex;
		  flex-wrap: wrap;
		  .uni-tag{
			  margin-top: 5px;
			  margin-right: 5px;
		  }
	  }
  }
</style>
